Auto set bi-directional jar

Abstract

An automatic set bi-directional apparatus for jarring an object in a well bore is disclosed. The apparatus comprises a tubular member having a portion defining an upper and lower striking shoulder, said tubular member having one end connected to a work string capable of creating a longitudinal force. A mandrel is connected to the object and the mandrel is concentrically disposed within said tubular member. The apparatus further includes a plurality of elongated members and an upper and lower ring members which serve as latch means. The mandrel further comprises a first and second grooved portion which are used for releasing the tubular member in order to deliver either an upward or downward jarring impact upon a stationary anvil.

I claim: 
     
       1. A jarring apparatus, comprising: a cylindrical housing containing hammer means;   a mandrel slidably disposed within said housing to form a spring chamber, said mandrel containing anvil means;   latch means for latching said mandrel to said cylindrical housing;   biasing means, positioned within the spring chamber, for biasing said latch means in an engaged position within said housing;   and wherein said mandrel further contains: first releasing means for releasing said latch means and allowing said hammer means to deliver an upper impact to said anvil means; and   second releasing means for releasing said latch means and allowing said hammer means to deliver a downward impact to said anvil means.     
     
     
       2. The jar of claim 1 wherein said mandrel contains: an internal and external shoulder;   and wherein said anvil means comprises: said external shoulder of said mandrel adapted to receive a downward impact from said hammer means;     and, said internal shoulder of said mandrel adapted to receive an upward impact from said hammer means.   
     
     
       3. The jar of claim 2 wherein said housing contains: an internal and external shoulder;   and wherein said hammer means comprises: said external shoulder of said housing adapted to downwardly impact said external shoulder of said mandrel;   and, said internal shoulder of said housing adapted to upwardly impact said internal shoulder of said mandrel.     
     
     
       4. The jar of claim 3 wherein said latching means comprises: a plurality of latch bars, said latch bar containing a first and second end, and a protuberance thereon, said protuberance having a first and second chamfered sides, said protuberance cooperating with said first and second releasing means; and   an upper ring receiving said first end of said latch bar; a lower ring receiving said second end of said latch bar; and wherein biasing means biases against the upper ring.   
     
     
       5. The jar of claim 4 wherein the biasing means comprises frusto-conical disc springs capable of storing kinetic energy. 
     
     
       6. The jar of claim 5 further comprising a biasing adjustment means, positioned within said housing, for adjusting the kinetic energy of said conical disc springs. 
     
     
       7. The jar of claim 6 wherein said upper ring comprises: a cylindrical member having a first end and second end, said first end engaging said biasing means and said second end having an angled end with a leg member extending therefrom, with said angled end cooperating with said first end of said elongated member.   
     
     
       8. The jar of claim 7 wherein said lower ring comprises: a cylindrical member having a first end and a second end, said first end engaging a second internal shoulder located on said housing and said second end having an angled end with a leg member extending therefrom, with said angled end cooperating with said second end of said elongated member.   
     
     
       9. The jar of claim 7 wherein the distance from the first releasing means to the second releasing means is the length of the stroke of the jar. 
     
     
       10. The jar of claim 7 wherein said mandrel is tapered between the first releasing means and the second releasing means. 
     
     
       11. An automatic set bi-directional apparatus for jarring an object in a well bore, comprising: a tubular member having a portion defining an upper and lower striking shoulder, said tubular member having one end connected to a work string capable of creating a longitudinal force;   a mandrel concentrically disposed within said tubular member, said mandrel having a first end and a second end, said second end being connected to the object, said mandrel containing an upper shoulder, and lower shoulder;   latch means for latching said housing to said mandrel;   a spring disposed about said mandrel and cooperating with said latch means;   upper releasing means, located on said mandrel, for releasing said tubular member so that said lower striker shoulder strikes said lower shoulder of said mandrel;   lower releasing means, located on said mandrel, for releasing said tubular member so that said upper striking shoulder strikes said upper shoulder of said mandrel; and   engaging means for engaging said latch means with said upper and lower releasing means.   
     
     
       12. The apparatus of claim 11, wherein said latch means comprises: a plurality of elongated members, said members containing a first chamfered end, a second chamfered end, and a protuberance, with said first and second chamfered end cooperating with said engaging means and said protuberance cooperating with said upper releasing means so that said protuberance is engaged with said upper releasing means.   
     
     
       13. The apparatus of claim 12, wherein said engaging means comprises: an upper cylindrical ring, disposed about said mandrel, said upper ring having a first surface engaging said spring and a second surface engaging said first chamfered end of said elongated member; and   a lower cylindrical ring, disposed about said mandrel, said lower ring having a first surface engaging an internal shoulder of said housing and a second surface engaging said second chamfered end of said elongated member.   
     
     
       14. The apparatus of claim 13, wherein said protuberance has a first and second angled surface, and wherein said upper releasing means comprises: a portion of said mandrel having an upper groove with a first and second angled side so that said first and second angled surface of said protuberance cooperates with the complementary first and second angled side of said groove;   and wherein said lower releasing means comprises:   a portion of said mandrel having a lower groove with a first and second angled side so that said first and second angled surface of said protuberance cooperates with the complementary first and second angled side of said groove.   
     
     
       15. The apparatus of claim 14, further comprising a biasing adjustment means, positioned within said tubular member, for adjusting the tension in the spring. 
     
     
       16. The apparatus of claim 15 wherein the distance from the upper releasing means to the lower releasing means is the length of the stroke of the apparatus. 
     
     
       17. The apparatus of claim 16 wherein said mandrel is tapered between the upper and lower releasing means so that said elongated members can expand upon release from said releasing means.